changed background

inc/footer.php

@@ -10,5 +10,21 @@ $build = preg_match('/[0-9a-f]{7,40}/i', $build, $m) ? $m[0] : ($build ?: 'dev')
   </div>
   <small>&copy; <?= date('Y') ?> · build: <a href="<?= htmlspecialchars(REPO_URL) ?>"><?= htmlspecialchars($build) ?></a></small>
 </footer>
+<?php require_once __DIR__ . '/backgrounds.php'; $bgs = bg_styles(); ?>
+<?php if (count($bgs) > 1): ?>
+<script>
+  /* Unlabelled: press b to flick through the backgrounds without reloading.
+     Not persisted -- the server picks a fresh one on every load anyway. */
+  (function () {
+    var all = <?= json_encode($bgs) ?>, root = document.documentElement;
+    document.addEventListener('keydown', function (e) {
+      if (e.key !== 'b' || e.metaKey || e.ctrlKey || e.altKey) return;
+      var t = e.target;
+      if (t && (t.tagName === 'INPUT' || t.tagName === 'TEXTAREA' || t.isContentEditable)) return;
+      root.dataset.bg = all[(all.indexOf(root.dataset.bg) + 1) % all.length];
+    });
+  })();
+</script>
+<?php endif; ?>
 </body>
 </html>